rxn enthalpy vs. rxn internal energy

Moderators: Chem_Mod, Chem_Admin

Kayla Danesh 1F
Posts: 38
Joined: Thu Jul 13, 2017 3:00 am

rxn enthalpy vs. rxn internal energy

Postby Kayla Danesh 1F » Mon Jan 15, 2018 9:59 pm

Why is the reaction enthalpy less negative (more positive) than the reaction internal energy for reactions that generate gases? I am having trouble understanding this idea. Thanks.

AtreyiMitra2L
Posts: 169
Joined: Fri Sep 29, 2017 7:03 am
Been upvoted: 1 time

Re: rxn enthalpy vs. rxn internal energy

Postby AtreyiMitra2L » Mon Jan 15, 2018 10:09 pm

I think because we are supposed to be looking at it in terms of the absolute value. In chemistry, we always take the system's perspective. In physics, however, we usually take the surrounding's perspective. Because of this discepancy, we look at it in terms of absolute value. Please don't hesitate to correct me if I'm wrong!


Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 2 guests